Engine Drivetrain 1st Gen Cooper S Inconsistant Boost?

Discussion in 'Tuning and Performance' started by wzabrouski, Feb 14, 2011.

Tags:
Most Liked Posts
  1. wzabrouski

    wzabrouski Active Member

    May 5, 2009
    304
    32
    28
    Executive Director
    Keller, TX
    Ratings:
    +32 / 0 / -0
    #1 wzabrouski, Feb 14, 2011
    As of late I have been noticing the boost from the sc kicking in at 4k, backing off, then kicking in again. All in between 4 & 6k. This is all with full throttle. Any ideas?
     
  2. sirhc

    sirhc New Member

    Feb 11, 2011
    8
    1
    0
    oklahoma city,ok
    Ratings:
    +1 / 0 / -0
    #2 sirhc, Feb 14, 2011
    my guess is bypass valve may be starting to leak
     
  3. wzabrouski

    wzabrouski Active Member

    May 5, 2009
    304
    32
    28
    Executive Director
    Keller, TX
    Ratings:
    +32 / 0 / -0
    #3 wzabrouski, Feb 14, 2011
    I put in a DT bypass valve less than a year ago. Would it fail this soon?
     
  4. sirhc

    sirhc New Member

    Feb 11, 2011
    8
    1
    0
    oklahoma city,ok
    Ratings:
    +1 / 0 / -0
    #4 sirhc, Feb 14, 2011
    it shouldnt have but anything is possible.have you checked your intercooler boots? or maybe your tensioner belt is slipping. so check the belt and the tensioner
     
  5. Nitrominis

    Nitrominis Banned

    May 9, 2009
    1,217
    61
    0
    Doing nothing
    Santa Cruz, CA
    Ratings:
    +61 / 0 / -0
    #5 Nitrominis, Feb 14, 2011
    what are you using to determine the boost and the rpm range?

    The unusual behavior you describe does not sound of the normal suspects.
     
  6. wzabrouski

    wzabrouski Active Member

    May 5, 2009
    304
    32
    28
    Executive Director
    Keller, TX
    Ratings:
    +32 / 0 / -0
    #6 wzabrouski, Feb 15, 2011
    Boost gauge and looking at the speedo. Belt is new within 3k.
     
  7. BThayer23

    BThayer23 Well-Known Member

    Jun 12, 2009
    1,315
    154
    63
    Civil Engineer
    Durham, NC
    Ratings:
    +155 / 0 / -0
    #7 BThayer23, Feb 15, 2011
    Auto or manual trans?

    And what year is your car? Sometimes the 05-06 cars don't like the DT bypass valve.
     
  8. wzabrouski

    wzabrouski Active Member

    May 5, 2009
    304
    32
    28
    Executive Director
    Keller, TX
    Ratings:
    +32 / 0 / -0
    #8 wzabrouski, Feb 15, 2011
    2006 auto
     
  9. BThayer23

    BThayer23 Well-Known Member

    Jun 12, 2009
    1,315
    154
    63
    Civil Engineer
    Durham, NC
    Ratings:
    +155 / 0 / -0
    #9 BThayer23, Feb 15, 2011
    Ditch the DT bypass valve and see if that helps.

    Otherwise PM BlimeyCabrio. He's got an 06 auto and knows all there is to know about intermittent boost problems, bypass valves, and the R53 auto tranny.
     
  10. wzabrouski

    wzabrouski Active Member

    May 5, 2009
    304
    32
    28
    Executive Director
    Keller, TX
    Ratings:
    +32 / 0 / -0
    #10 wzabrouski, Feb 16, 2011
    Just wondering why it is all of a sudden an issue when i have had it over a year.
     
  11. minimark

    minimark Well-Known Member

    Jun 24, 2009
    5,146
    1,302
    113
    Winston-Salem, NC
    Ratings:
    +1,302 / 0 / -0
    #11 minimark, Feb 16, 2011
    Get a smoke test done and see if you have any leaks, then go from there. 2cents
     
  12. BThayer23

    BThayer23 Well-Known Member

    Jun 12, 2009
    1,315
    154
    63
    Civil Engineer
    Durham, NC
    Ratings:
    +155 / 0 / -0
    #12 BThayer23, Feb 16, 2011
    Yeah, that's another good thought. Sometimes the intercooler boots develop cracks and holes, too.
     

Share This Page